Steam-engine



(No Model.) 2 Sheets-Shet; 1.

J. T. METGALFE.

STEAM ENGINE.

Patented Mar. 2,, 1886.

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(No Modl.) I 2 Sheets-FSheef 2. J. T. MBTCALPE.

STEAM ENGINE. No. 337,184. I Patented Mar. 2, 1886.

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Y lhvrrnn STATES PATENT Grinch.

JOHN METOALFE, OF oUINcY, PENNSYLVANlA.

STEAM-ENGINE.

SPECIFICATION forming part'ofLetters Patent N0. 337,184, dated March 2,1886. Application filed November 12, 1885. Serial No. 182,613. (No model.)

T all whom it may concern: 7

Be it known that I,-JOHN T. METGALFE, a citizen of the United States,r esid-ingat Quincy, in the county of Franklin and State of Pennsylvania, haveinvented certain new and useful Improvements in Steam-Engines; and I do declare the following to be a full, clear, and exact description oftheinvention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference markedthereomwhich form a part of this specification.

Figure 1 of the drawings is'a vertical transverse section. Figs. 2, 3, 4, and are sectional details.

This invention relates to the class of steamengines having two single-actin g cylinders the pistons of which work alternately, and has especial reference to the valve mechanism for controlling the ports thereof.

The invention consists in the construction and novel arrangement of parts hereinafter described, and pointed out in the claims appended.

In my application, Serial No. 164,918, filed May 9, 1885, the valve mechanism is shown, as it is necessary to the understanding of other parts of the engine; but no claims are therein made to said valve mechanism, as it is subjectmatter for another application.

Referring to the accompanying drawings by letter, A designates each of the two cylinders of the engine, in which move the pistons B B.

C O are the connecting-rods, attached in the usual manner to the diametrically-opposite cranks d d on the shaft D, which has bearings at its ends in the heads of the casing E.

F is a casing secured to the top of the cylinders, and forming therewith the val vechamber G.

J is a crank on the stem h of the valve H, by means of which crank and the eccentric-rod K the valve is oscillated.

M is the steanrpipe from the boiler to the valve-chamber G.

The ports I I of the cylinders A open above through the floor of the casing Finto the chamber G. The said ports open on the valve H at opposite points below its center.

0 is a vertical chamber in the casing of the machine, in which chamber the rod K moves.

throw in the reverse direction to that which it does when the screw is in the other end of the slot.

The spindle or stem h of the valve H has a bearing in the outer wall of the chamber 0, through which wall passes the horizontal adjusting-screw 0 to regulate the position of the valve, and upon which the end of the stem h turns. The taper of the valve is such that it will wear in its bearing equally with the wear of the end of the stem against the screw 0 so that the valve will always keep tight. The valve-chamber opens into the space 0, and the valve will enter therein slightly as it wears, so that by this construction no stuflingboxes are necessary.

S is a removable cap which fits above the open end of the space 0, and s is a retainingbar,which, by means of the screw, 8, holds the cap in place. By taking the screw out the cap may be removed to examine the parts within the space 0.

T is the exhaust-chamber, descending from the bottom of the valve-chamber between the portsIl, and then running outward, as shown. The valve H has a central longitudinal recess, h, running from its base inward, and pro vided with the side openings,V V, so situated that the former communicates in succession with the port I, the mouth of the exhaustchamber, and the port I, as the valve oscillates in one direction, and communicates reversely with the same when the valve oscillates reversely. \V V are opposite longitudinal recesses on the surface of the valve midway between the openings V V, and communicating together through the canal V X, X, and X are longitudinal recesses in the roof of the valve-chamber, respectively opposite the port I, the mouth of the exhaust-chamber T, and the port I, and having the same length and width thereas. As the opening V moves over the port I, the mouth of the ex;

haust-chamber, and the port I, the opening V moves over the recesses "X, X, and X", so that exactly the same exhaust or pressure is created on each side of the valve,which is consequently steam-balanced.

The recess IV is so situated that when the port I is taking steam from the opening V it will make communication between the port I and the mouth of the exhaust-chamber and the reverse, and when port I is exhausting, as the recesses W W communicate, the recesses X X will also exhaust, as is plain from the description and drawings.

The steam-pressure from the pipe M being always upon the base of the valve will keep it always tight and will drive it farther inward as it wears.

It is evident from the foregoing description and from the drawings that the cylinders must be adjusted to each other, and that the eccentric and rod must be to one side of the cylinders, otherwise the construction of the valve would have to be different.

Having described my invention, I claim 1. In adouble-cylinder single-acting engine, 25 the combination of the valve-crank chamber having the bearing 0, the oscillating valve H, provided with the stem h, supported in said bearing, the said valve receiving steam-pressure at its large end, and the adjusting-screw 0 engaging the said stem, substantially as specified.

2. In a steam-engine, the combination, with a valve-casing having aplurality of recesses arranged, respectively, at diametrically-opposite points to the eduction and induction ports and the exhaust-aperture, and an oscillating valve having a transverse aperture adapted to comn1 unicate with the said ports and recesses, and the longitudinal aperture connecting with the steam-ports, substantially as specified.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN T. METCALFE.

W'itnesses:

D. M. Goon, Jr., JOHN L. ME'roALFE. 

